I think you've got something there. Each TF seems to represent a part of our society or our personalities, be it Prowl's quietness, Sunstreaker's vanity, Prime's overdevloped sense of honor. And this is why they are so widespread. Everyone has something they can relate to, even girls, despite the lack of female characters. Your favorite character, then, is the one who is most like you, who you would be if you were a TF. Prowl's mine because of his calmness, his quiet dedication to his job, his intelligence, and generally being well-balanced. He's right where I'd want to be if I was a TF.
R.
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Pain heals, chicks dig scars, but glory is forever.
Transformers TNG--The ultimate in TF gaming.
Do not talk smack to the dragon.--Ancient Gibsonian proverb
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If you enjoy torture racks, iron maidens, chain saws, and lots of pain, be sure to stop by RCOSD and Redstreak's basement in the TF Archive building.